@book { MeineSchwangerschaftTagfrTag,
    title = "Meine Schwangerschaft - Tag für Tag",
    author = "Gabriele {Grünebaum} and Dr. med. Loay {Okko}",
    year = "2010",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403509"
}